Jameson Lopp identified approximately 48,000 suspected Bitcoin address poisoning attacks between July 2023 and January 2025

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Jameson Lopp, co-founder and chief security officer of Bitcoin secure storage firm Casa, conducted an analysis of address poisoning attacks on Bitcoin, scanning the entire blockchain and identifying 48,000 suspected attacks since 2023. Lopp identified transactions with one input and one output consisting of two different wallets with the same first four and last four characters, a strong signal of an address poisoning attack.

"Over these 18 months, just shy of 48,000 transactions were sent that match this profile of potential address poisoning," Lopp added.